Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 765

Applying DSCP and VLAN Match Criteria on a Service Queue You can configure Layer 3 class maps which contain both a Layer 3 Differentiated Services Code Point (DSCP) and IP VLAN IDs as match criteria to filter incoming packets on a service queue on the switch. To configure a Layer 3 class map to classify traffic according to both an IP VLAN ID and DSCP value, use the match ip vlan vlan-id command in class-map input configuration mode. You can include the class map in a policy map, and apply the class and policy map to a service queue using the service-queue command. In this way, the system applies the match criteria in a class map according to queue priority (queue numbers closer to 0 have a lower priority). To configure IP VLAN and DSCP match criteria in a Layer 3 class map, and apply the class and policy maps to a service queue: 1 Create a match-any or a match-all Layer 3 class map, depending on whether you want the packets to meet all or any of the match criteria. By default, a Layer 3 class map is created if you do not enter the layer2 option with the class-map command. When you create a class map, you enter the class-map configuration mode. CONFIGURATION mode Dell(conf)#class-map match-all pp_classmap 2 Configure a DSCP value as a match criterion. CLASS-MAP mode Dell(conf-class-map)#match ipdscp 5 3 Configure an IP VLAN ID as a match criterion. CLASS-MAP mode Dell(conf-class-map)#match ip vlan 5 4 Create a QoS input policy. CONFIGURATION mode Dell(conf)#qos-policy-input pp_qospolicy 5 Configure the DSCP value to be set on matched packets. QOS-POLICY-IN mode Dell(conf-qos-policy-in)#set ip-dscp 5 6 Create an input policy map. CONFIGURATION mode Dell(conf)#policy-map-input pp_policmap 7 Create a service queue to associate the class map and QoS policy map. POLICY-MAP mode Dell(conf-policy-map-in)#service-queue 0 class-map pp_classmap qos-policy pp_qospolicy Ordering ACL Rules When you link class-maps to queues using the service-queue command, the system matches the class-maps according to queue priority (queue numbers closer to 0 have lower priorities). For example, as described in the previous example, class-map cmap2 is matched against ingress packets before cmap1. ACLs acl1 and acl2 have overlapping rules because the address range 20.1.1.0/24 is within 20.0.0.0/8. Therefore (without the keyword order), packets within the range 20.1.1.0/24 match positive against cmap1 and are buffered in queue 7, although you intended for these packets to match positive against cmap2 and be buffered in queue 4. Quality of Service (QoS) 765